I will perform the following steps to build your project with Ninja:

1. **Fix Toolchain Configuration**:

   * Modify `cmake/toolchain_arm_gcc.cmake` to remove the hardcoded path `D:/ARM_GCC/bin/`. This will allow CMake to automatically find the `arm-none-eabi-gcc` toolchain from your system's PATH.

2. **Clean Build Environment**:

   * Clean the `build` directory to remove old cache and configuration files, ensuring a clean state for the Ninja generator.

3. **Configure Build**:

   * Run `cmake -G "Ninja" ..` in the `build` directory to generate the Ninja build files.

4. **Run Build**:

   * Execute `ninja` to start the compilation process.

5. **Analyze and Fix**:

   * I will monitor the build output. If any compilation errors occur (e.g., missing headers, flag issues), I will analyze and apply fixes immediately.